cal_extraterrestrialRadiation_for_shorter

Calculating extraterrestrial radiation for hourly or shorter periods

Supports the calculation of meteorological characteristics in
evapotranspiration research and reference crop evapotranspiration, and offers
three models to simulate crop evapotranspiration and soil water balance in
the field, including single crop coefficient and dual crop coefficient,
as well as the Shuttleworth-Wallace model. These calculations main refer to
Allen et al.(1998, ISBN:92-5-104219-5), Teh (2006, ISBN:1-58-112-998-X), and
Liu et al.(2006) <doi:10.1016/j.agwat.2006.01.018>.

Minguo Liu

simET

Tools for Simulation of Evapotranspiration of Field Crops and
Soil Water Balance

Huimin Yang

cal_extraterrestrialRadiation_for_shorter function

<dl><dt>lat</dt>
<dd>latitude (radian), positive for the northern hemisphere and negative
for the southern hemisphere.</dd>
<dt>J</dt>
<dd>is the number of the day in the year between 1 (1 January) and 365
or 366 (31 December).</dd>
<dt>t</dt>
<dd>standard clock time at the midpoint of the period (hour). For example
for a period between 14.00 and 15.00 hours, t = 14.5.</dd>
<dt>lz</dt>
<dd>longitude of the centre of the local time zone (degrees west of Greenwich).
For example, Lz = 75, 90, 105 and 120° for the Eastern, Central, Rocky Mountain
and Pacific time zones (United States) and Lz = 0° for Greenwich, 330°
for Cairo (Egypt),and 255° for Bangkok (Thailand), radian.</dd>
<dt>lm</dt>
<dd>longitude of the measurement site (degrees west of Greenwich) radian.</dd>
<dt>t1</dt>
<dd>length of the calculation period (hour)</dd></dl>

Arguments

Calculating extraterrestrial radiation for hourly or shorter periods — cal_extraterrestrialRadiation_for_shorter

<dl>

<dt>lat</dt>
<dd>latitude (radian), positive for the northern hemisphere and negative
for the southern hemisphere.</dd>


<dt>J</dt>
<dd>is the number of the day in the year between 1 (1 January) and 365
or 366 (31 December).</dd>


<dt>t</dt>
<dd>standard clock time at the midpoint of the period (hour). For example
for a period between 14.00 and 15.00 hours, t = 14.5.</dd>


<dt>lz</dt>
<dd>longitude of the centre of the local time zone (degrees west of Greenwich).
For example, Lz = 75, 90, 105 and 120° for the Eastern, Central, Rocky Mountain
and Pacific time zones (United States) and Lz = 0° for Greenwich, 330°
for Cairo (Egypt),and 255° for Bangkok (Thailand), radian.</dd>


<dt>lm</dt>
<dd>longitude of the measurement site (degrees west of Greenwich) radian.</dd>


<dt>t1</dt>
<dd>length of the calculation period (hour)</dd>

</dl>

cal_extraterrestrialRadiation_for_shorter: Calculating extraterrestrial radiation for hourly or shorter periods

Description

Usage

Value

Arguments

References